4ms Company Dual Looping Delay Manuale d'uso - Pagina 14
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the SISM's Shift knob up to about 2:00. Patch the SISM channel's output to the Looping Delay's
Feedback CV jack.
Now you can activate the "record" CV like in the previous patch to lay down new material, but you can
also activate the "clear" CV to fade out material from the loop. You can even activate both pads at the
same time to replace loop material with new material.
What's happening in this patch is that the SISM is turning the 0V to 5V signal (or 8V or whatever the
maximum) from the pad module into a 5V to 0V signal. So, the SISM will output around 5V if you are
not pressing on the manual pressure pad (no CV signal). This means the Looping Delay's Feedback
will be 100%. As you press on the pad and increase the voltage from the pad module, the SISM will
decrease its output voltage, which decreases the Feedback parameter. When Feedback is low,
material from the loop fades away.
Note that if your loop is not looping at 100%, then the SISM's Shift knob needs to be turned up a bit.
This insures at least 5V is coming out of the SISM when nothing is being input.
Granular Scrubbing
A really neat effect can be obtained by changing the Reverse jack to respond to gates, and patching a
PWM pulse wave into it. This allows you to scrub across "grains" in an audio loop at variable playback
speed without changing the pitch.
First, enter System Setting Mode and set the Reverse jack to Gate Mode (See System Settings Mode,
page 16). Then patch audio into the In jack and take the output from the Audio Out jack. Tap a slow
tempo, maybe one second, and set Time so the loop time is a couple seconds. Turn Feedback down
and Delay Feed up. Play some audio, perhaps a drum loop, a vocal sample, or a melody line. Let the
audio play through (make sure Mix is set at least 50/50), and then press Inf. Hold to lock in the loop.
Listen to the loop play once or twice to get a feel for what it sounds like normally.
Now the trick! Patch a pulse wave with variable pulse width (sometimes called PWM) from your favorite
LFO or clock module to the Reverse jack. The 4ms QCD with the QCD Expander work nicely by using
the Gate PW knob to adjust pulse width. You can also use the EOR or EOF output from the any of the
4ms EnvVCA modules and use the ratio of Rise and Fall sliders to set the pulse width. The frequency
should be between about 2Hz and about 20Hz.
At first, set the pulse width to about 60-70% or so. You should see the Reverse light flicker, and the
loop should immediately start playing slowly forward or backwards. Tap the Reverse button to make it
play the other direction. Change the LFO's pulse width to adjust the playback rate. As you approach
50%, the loop will slow down, until it hovers at 50% and then starts playing back in the opposite
direction.
The frequency of the VCO changes the "grain" size. At 2Hz there is a noticeable "stutter", and at 20Hz it
sounds like a medium/low fidelity granular effect. If the VCO is too fast or if the pulse width is too
extreme, the effect will be lost.
The reason this effect works is because it plays forward when the pulse is low and backwards when the
pulse is high (or vice-versa if you toggled Reverse with the button). So, a pulse width of 50% will
effectively hover on a single grain because it plays forward and backwards equally. But, a pulse width
of 60% will play forward for 60% of the time and backwards 40% of the time, thus slowly moving
forward at 20% speed. The makes the audio slow down to 1/5 speed without any pitch shifting.
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